Miele kf 3855 s-6 fridge part not working. Where is the thermostat?

Fridge part of unit does not work. The accumulater thing on the back is not working in any range from 1 to 4. The light comes on when the control is turned from 0 to 1 but the fridge does not cool. I took front panel off to look at the thermostat at the top of the fridge to find only a pcb. I am presuming the problem may be the thermostat. How do i find it please or has anyone have a better idea of what it is.
Thanks

The PCB is probably the temperature controller and most likely uses electronic temperature sensors in the refrigerator and freezer sections. Not having seen this model before, I'm guessing, but perhaps there is a problem with defrosting such as a clogged defroster drain tube, and the insulation between the freezer and refrigerator is iced up. This could also coat the refrigerator temperature sensor in ice if it is on the divider between the two compartments, thus fooling the controller into thinking the refrigerator is too cold. A manual defrost or drain tube inspection should rule this out.

6 Suggested Answers

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.goodluck!

This is a Sub Zero and many technicians do not realize that these units most all run on 2 separate systems. 2 cold controls 2 compressors 2 evaporators. They share a condenser and condenser fan motor. What you are describing is most likely a bad cold control. It is pretty common for these to get some age and go bad. If you are very savvy with repairs yourself then if you access the compressor area and feel that the compressor on the right is cool and the compressor on the left is warm then you know that the ref. compressor has not been running. UNPLUG THE UNIT OR CUT THE BREAKER OFF. Remove the shelving from the fresh food section and the cover to the lights and the panel below the lights and lean the back panel forward to access the cold control. You will see 3 wires to the cold control. The green wire is the ground wire of corse. Unplug the other 2 wires remembering their location on the control unit. Take a jumper wire and jump these 2 wires. If when you power the unit up the right side compressor comes on then you know that your fresh food cold control is bad. Replace fresh food cold control.

Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.

Your description is quite complete but is rather baffling. Pls bear with me while we process by elimination. A few basic/working ideas:

most designs call for a single compressor to cool the freezer;

the cold air in the freezer is drawn towards the fridge to cool that area;

this is performed by a fan drawing air in the freezer through the evaporator;

most would have a vent or air pathway to guide the freezer air;

all would have thermostatic control to set the desired temperature;

some designs have two thermostatic control , 1 for the freezer, 1 for the fridge.

As applied to your concern:

compressor is working since freezer is OK;

fan is working as you posted but is the air drawn from the freezer, better still, is the air forced/vented into the fridge?

could you please check that the air is strongly blown into the fridge area;

a little experiment, open the fridge door, look for and press on the door switch, the light should go out, after a lengthy seconds, the fan should trigger on, not only would it be audible, you would notice the frozen air swirling inside the fridge area. If you hold on long enough to the dorr switch, the compressor should kick in (if it is not already running) since the thermostat of the fridge area (if one is present) would sense that the fan is turning but the fridge area is not cooling.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

fridges and freezers work on the following principal: the freezer area is cooled and the cold air is circulated and shared with the fridge area.
So the keys to a good working unit are first to set the freezer so that it is at the desired temperature, then adjust the fridge control to get the desired fridge temperature
air flow is the only thing that the fridge thermostat controls, so keep the clutter in the fridge to a minimum
also dirt and hair dust etc build up on most appliances that have a fan so clean the areas around the back and bottom of the unit
remember any time you work on an electrical appliance unplug it first
lastly fridges with frost free designs need to have a clear drain from under the freezer all the way down to the bottom where the compressor motor is make sure this is also kept clean
if this fails to solve your problem then likely there is a leak in the system or compressor problem, but if this is the case your freezer will not work correctly either
remember the only cooling is done at the freezer znd cold air is sent through the fridge
lastly obviously the fridge and freezer are highly insulated and sealed and these are both important

without checking equipment you can only assume things that may go wrong...1st..try fully defrosting complete unit,clean all vent/drain holes then switch back on and let unit do its thing for 24 hours.then check temperatures are minus 18-20c for freezer and plus 2-5c for fridge (approx)unless you have electrical meters to check, this is just about all you can do..

sounds like the thermostat inside the fridge has gone. The information I have provided is a guide and is not directly related to the make and model of the appliance brand you have but seems to cover the majority of household fridge freezers I have come accross. There is a dial inside the fridge usually up on the right side wall of the fridg where the light is. It is usual for the thermostat unit to be inside the plastic housing behind the dial. It is easy to replace the thermostat because I have done it myself and it worked. I am not an expert so if I can do it then anybody could. the unit is usually a standard replacement unit which costs roughly £20.00 available from fridge freezer repair shops. I got my replacement from Sale Appliances, Victoria Avenue, Southend-on-Sea, Essex. The unit comes with the thermometer type wire which fixes to the back of the fridge - inside that is- already attatched to it and all you need to do is remove the screw holding the housing in place (unplug from mains first of course), remove bulb, prise off the plastic housing to reveal thermostat unit, take some detailed pictures of how the wires are attatched or take detailed notes and diagrams, pull off the eelectical connectors (may need a pair of pliers to help, but must be gentle so as not to rip wires out of the connectors), put in new thermostat and rewire as it was before. You will not have to literally rewire the thing but simply slide the wired connectors onto the correct place. The connections are numbered both on the old unit as well as the new unit. Dont worry if the connectors on the rear of the new unit is different to the old one so long as you connect the wires to the same number it wont matter where that connector is located e.g. number two always fixes to the number two marked on the unit, number 3 to numbr 3 etc.